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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 18:37:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 18:37:14 +0000
commitea648e70a989cca190cd7403fe892fd2dcc290b4 (patch)
treee2b6b1c647da68b0d4d66082835e256eb30970e8 /bin/dig/host.html
parentInitial commit. (diff)
downloadbind9-ea648e70a989cca190cd7403fe892fd2dcc290b4.tar.xz
bind9-ea648e70a989cca190cd7403fe892fd2dcc290b4.zip
Adding upstream version 1:9.11.5.P4+dfsg.upstream/1%9.11.5.P4+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<!--
+ - Copyright (C) 2000-2002, 2004, 2005, 2007-2009, 2014-2019 Internet Systems Consortium, Inc. ("ISC")
+ -
+ - This Source Code Form is subject to the terms of the Mozilla Public
+ - License, v. 2.0. If a copy of the MPL was not distributed with this
+ - file, You can obtain one at http://mozilla.org/MPL/2.0/.
+-->
+<html lang="en">
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>host</title>
+<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry">
+<a name="man.host"></a><div class="titlepage"></div>
+
+
+
+
+
+ <div class="refnamediv">
+<h2>Name</h2>
+<p>
+ host
+ &#8212; DNS lookup utility
+ </p>
+</div>
+
+
+
+ <div class="refsynopsisdiv">
+<h2>Synopsis</h2>
+ <div class="cmdsynopsis"><p>
+ <code class="command">host</code>
+ [<code class="option">-aCdlnrsTUwv</code>]
+ [<code class="option">-c <em class="replaceable"><code>class</code></em></code>]
+ [<code class="option">-N <em class="replaceable"><code>ndots</code></em></code>]
+ [<code class="option">-R <em class="replaceable"><code>number</code></em></code>]
+ [<code class="option">-t <em class="replaceable"><code>type</code></em></code>]
+ [<code class="option">-W <em class="replaceable"><code>wait</code></em></code>]
+ [<code class="option">-m <em class="replaceable"><code>flag</code></em></code>]
+ [
+ [<code class="option">-4</code>]
+ | [<code class="option">-6</code>]
+ ]
+ [<code class="option">-v</code>]
+ [<code class="option">-V</code>]
+ {name}
+ [server]
+ </p></div>
+ </div>
+
+ <div class="refsection">
+<a name="id-1.7"></a><h2>DESCRIPTION</h2>
+
+
+ <p><span class="command"><strong>host</strong></span>
+ is a simple utility for performing DNS lookups.
+ It is normally used to convert names to IP addresses and vice versa.
+ When no arguments or options are given,
+ <span class="command"><strong>host</strong></span>
+ prints a short summary of its command line arguments and options.
+ </p>
+
+ <p><em class="parameter"><code>name</code></em> is the domain name that is to be
+ looked
+ up. It can also be a dotted-decimal IPv4 address or a colon-delimited
+ IPv6 address, in which case <span class="command"><strong>host</strong></span> will by
+ default
+ perform a reverse lookup for that address.
+ <em class="parameter"><code>server</code></em> is an optional argument which
+ is either
+ the name or IP address of the name server that <span class="command"><strong>host</strong></span>
+ should query instead of the server or servers listed in
+ <code class="filename">/etc/resolv.conf</code>.
+ </p>
+
+ </div>
+
+ <div class="refsection">
+<a name="id-1.8"></a><h2>OPTIONS</h2>
+
+ <div class="variablelist"><dl class="variablelist">
+<dt><span class="term">-4</span></dt>
+<dd>
+ <p>
+ Use IPv4 only for query transport.
+ See also the <code class="option">-6</code> option.
+ </p>
+ </dd>
+<dt><span class="term">-6</span></dt>
+<dd>
+ <p>
+ Use IPv6 only for query transport.
+ See also the <code class="option">-4</code> option.
+ </p>
+ </dd>
+<dt><span class="term">-a</span></dt>
+<dd>
+ <p>
+ "All". The <code class="option">-a</code> option is normally equivalent
+ to <code class="option">-v -t <code class="literal">ANY</code></code>.
+ It also affects the behaviour of the <code class="option">-l</code>
+ list zone option.
+ </p>
+ </dd>
+<dt><span class="term">-c <em class="replaceable"><code>class</code></em></span></dt>
+<dd>
+ <p>
+ Query class: This can be used to lookup HS (Hesiod) or CH
+ (Chaosnet) class resource records. The default class is IN
+ (Internet).
+ </p>
+ </dd>
+<dt><span class="term">-C</span></dt>
+<dd>
+ <p>
+ Check consistency: <span class="command"><strong>host</strong></span> will query the
+ SOA records for zone <em class="parameter"><code>name</code></em> from all
+ the listed authoritative name servers for that zone. The
+ list of name servers is defined by the NS records that are
+ found for the zone.
+ </p>
+ </dd>
+<dt><span class="term">-d</span></dt>
+<dd>
+ <p>
+ Print debugging traces.
+ Equivalent to the <code class="option">-v</code> verbose option.
+ </p>
+ </dd>
+<dt><span class="term">-i</span></dt>
+<dd>
+ <p>
+ Obsolete.
+ Use the IP6.INT domain for reverse lookups of IPv6
+ addresses as defined in RFC1886 and deprecated in RFC4159.
+ The default is to use IP6.ARPA as specified in RFC3596.
+ </p>
+ </dd>
+<dt><span class="term">-l</span></dt>
+<dd>
+ <p>
+ List zone:
+ The <span class="command"><strong>host</strong></span> command performs a zone transfer of
+ zone <em class="parameter"><code>name</code></em> and prints out the NS,
+ PTR and address records (A/AAAA).
+ </p>
+ <p>
+ Together, the <code class="option">-l -a</code>
+ options print all records in the zone.
+ </p>
+ </dd>
+<dt><span class="term">-N <em class="replaceable"><code>ndots</code></em></span></dt>
+<dd>
+ <p>
+ The number of dots that have to be
+ in <em class="parameter"><code>name</code></em> for it to be considered
+ absolute. The default value is that defined using the
+ ndots statement in <code class="filename">/etc/resolv.conf</code>,
+ or 1 if no ndots statement is present. Names with fewer
+ dots are interpreted as relative names and will be
+ searched for in the domains listed in
+ the <span class="type">search</span> or <span class="type">domain</span> directive
+ in <code class="filename">/etc/resolv.conf</code>.
+ </p>
+ </dd>
+<dt><span class="term">-r</span></dt>
+<dd>
+ <p>
+ Non-recursive query:
+ Setting this option clears the RD (recursion desired) bit
+ in the query. This should mean that the name server
+ receiving the query will not attempt to
+ resolve <em class="parameter"><code>name</code></em>.
+ The <code class="option">-r</code> option
+ enables <span class="command"><strong>host</strong></span> to mimic the behavior of a
+ name server by making non-recursive queries and expecting
+ to receive answers to those queries that can be
+ referrals to other name servers.
+ </p>
+ </dd>
+<dt><span class="term">-R <em class="replaceable"><code>number</code></em></span></dt>
+<dd>
+ <p>
+ Number of retries for UDP queries:
+ If <em class="parameter"><code>number</code></em> is negative or zero, the
+ number of retries will default to 1. The default value is
+ 1, or the value of the <em class="parameter"><code>attempts</code></em>
+ option in <code class="filename">/etc/resolv.conf</code>, if set.
+ </p>
+ </dd>
+<dt><span class="term">-s</span></dt>
+<dd>
+ <p>
+ Do <span class="emphasis"><em>not</em></span> send the query to the next
+ nameserver if any server responds with a SERVFAIL
+ response, which is the reverse of normal stub resolver
+ behavior.
+ </p>
+ </dd>
+<dt><span class="term">-t <em class="replaceable"><code>type</code></em></span></dt>
+<dd>
+ <p>
+ Query type:
+ The <em class="parameter"><code>type</code></em> argument can be any
+ recognized query type: CNAME, NS, SOA, TXT, DNSKEY, AXFR, etc.
+ </p>
+ <p>
+ When no query type is specified, <span class="command"><strong>host</strong></span>
+ automatically selects an appropriate query type. By default, it
+ looks for A, AAAA, and MX records.
+ If the <code class="option">-C</code> option is given, queries will
+ be made for SOA records.
+ If <em class="parameter"><code>name</code></em> is a dotted-decimal IPv4
+ address or colon-delimited IPv6
+ address, <span class="command"><strong>host</strong></span> will query for PTR
+ records.
+ </p>
+ <p>
+ If a query type of IXFR is chosen the starting serial
+ number can be specified by appending an equal followed by
+ the starting serial number
+ (like <code class="option">-t <code class="literal">IXFR=12345678</code></code>).
+ </p>
+ </dd>
+<dt>
+<span class="term">-T, </span><span class="term">-U</span>
+</dt>
+<dd>
+ <p>
+ TCP/UDP:
+ By default, <span class="command"><strong>host</strong></span> uses UDP when making
+ queries. The <code class="option">-T</code> option makes it use a TCP
+ connection when querying the name server. TCP will be
+ automatically selected for queries that require it, such
+ as zone transfer (AXFR) requests. Type ANY queries default
+ to TCP but can be forced to UDP initially using <code class="option">-U</code>.
+ </p>
+ </dd>
+<dt><span class="term">-m <em class="replaceable"><code>flag</code></em></span></dt>
+<dd>
+ <p>
+ Memory usage debugging: the flag can
+ be <em class="parameter"><code>record</code></em>, <em class="parameter"><code>usage</code></em>,
+ or <em class="parameter"><code>trace</code></em>. You can specify
+ the <code class="option">-m</code> option more than once to set
+ multiple flags.
+ </p>
+ </dd>
+<dt><span class="term">-v</span></dt>
+<dd>
+ <p>
+ Verbose output.
+ Equivalent to the <code class="option">-d</code> debug option.
+ Verbose output can also be enabled by setting
+ the <em class="parameter"><code>debug</code></em> option
+ in <code class="filename">/etc/resolv.conf</code>.
+ </p>
+ </dd>
+<dt><span class="term">-V</span></dt>
+<dd>
+ <p>
+ Print the version number and exit.
+ </p>
+ </dd>
+<dt><span class="term">-w</span></dt>
+<dd>
+ <p>
+ Wait forever: The query timeout is set to the maximum possible.
+ See also the <code class="option">-W</code> option.
+ </p>
+ </dd>
+<dt><span class="term">-W <em class="replaceable"><code>wait</code></em></span></dt>
+<dd>
+ <p>
+ Timeout: Wait for up to <em class="parameter"><code>wait</code></em>
+ seconds for a reply. If <em class="parameter"><code>wait</code></em> is
+ less than one, the wait interval is set to one second.
+ </p>
+ <p>
+ By default, <span class="command"><strong>host</strong></span> will wait for 5
+ seconds for UDP responses and 10 seconds for TCP
+ connections. These defaults can be overridden by
+ the <em class="parameter"><code>timeout</code></em> option
+ in <code class="filename">/etc/resolv.conf</code>.
+ </p>
+ <p>
+ See also the <code class="option">-w</code> option.
+ </p>
+ </dd>
+</dl></div>
+
+ </div>
+
+ <div class="refsection">
+<a name="id-1.9"></a><h2>IDN SUPPORT</h2>
+
+ <p>
+ If <span class="command"><strong>host</strong></span> has been built with IDN (internationalized
+ domain name) support, it can accept and display non-ASCII domain names.
+ <span class="command"><strong>host</strong></span> appropriately converts character encoding of
+ domain name before sending a request to DNS server or displaying a
+ reply from the server.
+ If you'd like to turn off the IDN support for some reason, defines
+ the <code class="envar">IDN_DISABLE</code> environment variable.
+ The IDN support is disabled if the variable is set when
+ <span class="command"><strong>host</strong></span> runs.
+ </p>
+ </div>
+
+ <div class="refsection">
+<a name="id-1.10"></a><h2>FILES</h2>
+
+ <p><code class="filename">/etc/resolv.conf</code>
+ </p>
+ </div>
+
+ <div class="refsection">
+<a name="id-1.11"></a><h2>SEE ALSO</h2>
+
+ <p><span class="citerefentry">
+ <span class="refentrytitle">dig</span>(1)
+ </span>,
+ <span class="citerefentry">
+ <span class="refentrytitle">named</span>(8)
+ </span>.
+ </p>
+ </div>
+
+</div></body>
+</html>